Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/public/model/cluster_discovery_test.go

@@ -0,0 +1,50 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestClusterDiscovery(t *testing.T) {
+	o := ClusterDiscovery{
+		Type:        "test_type",
+		ClusterName: "cluster_name",
+		Hostname:    "test_hostname",
+	}
+
+	result1 := o
+	result2 := o
+	result3 := o
+
+	o.Id = "0"
+	result1.Id = "1"
+	result2.Id = "2"
+	result3.Id = "3"
+	result3.Hostname = "something_diff"
+
+	assert.True(t, o.IsEqual(&result1))
+
+	list := make([]*ClusterDiscovery, 0)
+	list = append(list, &o)
+	list = append(list, &result1)
+	list = append(list, &result2)
+	list = append(list, &result3)
+
+	rlist := FilterClusterDiscovery(list, func(in *ClusterDiscovery) bool {
+		return !o.IsEqual(in)
+	})
+
+	assert.Len(t, rlist, 1)
+
+	o.AutoFillHostname()
+	o.Hostname = ""
+	o.AutoFillHostname()
+
+	o.AutoFillIPAddress("", "")
+	o.Hostname = ""
+	o.AutoFillIPAddress("", "")
+}